I know, right? People's clothing options are so stupid in X, particularly Seymour. The Spira clothing industry is the REAL villain of FFX.
Plus, Lulu would sweat like a pig in her big fluffy dress in the tropical climate at the beginning of the game, whilst most of the main cast would have frozen to death in the mountains. Why couldn't the main characters have had costume changes? It's not like they were in a massive rush, they could have bought and changed into new clothes during their stopovers. Ludicrous.